Finding the Third Proportional to 111,719.25 and 239,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,719.25 : 239,428.50 = 239,428.50 : x
2. Step 2: Convert to fraction form
   111,719.25/239,428.50 = 239,428.50/x
3. Step 3: Cross multiply
   111,719.25x = 239,428.50 × 239,428.50
4. Step 4: Simplify right side
   111,719.25x = 57,326,006,612.25
5. Step 5: Solve for x
   x = 57,326,006,612.25/111,719.25
6. Step 6: Final answer
   x = 513,125.59